rosa en



April 23, 1963 o. E. ROSAEN VARIABLE DELIVERY PUMPS 3 Sheets-Sheet 1Filed Dec, 19. 1955 ow mom 5 INVENTOR. OSCAR E. ROSAEN ATTORNEYS April23, 1963 o. E. ROSAEN VARIABLE DELIVERY PUMPS Filed Dec. 19, 1955 3Sheets-Sheet 3 INVENTOR. OSCAR EJROSAEN ATTORNEYS United States Patent3,086,475 VARIABLE DELIVERY PUMPS Oscar E. Rosaen, 51 Cloverly Road,Grosse Points 36, Mich. Filed Dec. 19, 1955, Scr. No. 557,222 2 Claims.(Cl. 103-436) The present invention relates to fluid pumps of the vanetype and more specifically to such a pump provided with means whereby tocontrol the output.

Among the objects of the invention is to provide in a pump of the kindindicated, a simple adjusting means by which. the volume of fluid movedper revolution of the rotor may be varied from full capacity to zero.

Another object is to simplify the construction of such a pump andthereby to reduce the cost of production.

Another object is means by which the pressure of the vanes against thesurrounding .ring may be controlled.

Other objects and advantages will readily occur to those skilled in theart upon reference to the following description and the accompanyingdrawings in which- FIG. 1 is a longitudinal section of the pump on line11 of FIG. 2.

FIG. 2 is'a vertical section on line 2-2 of FIG. 1.

FIG. 3 shows in elevation the right hand cheek plate of FIG. 1 withcertain other parts in section.

FIG. 4 is a view as from the bottom of FIG. 3.

FIG. 5 is a view in "elevation of the cam ring and rotor.

FIG. 6 is a view from the bottom of FIG. 5.

FIG. 7 is a view in elevation of the inner face of the left hand cheekplate of FIG. 1.

FIG. 8 is a view in elevation of the outer face of the. same.

FIG. 9 is a side view of the rotor partly in section.

FIGS. 10 and 11 are respectively side and end elevational views of oneof the vanes.

FIG. 12 is a view in elevation of the control valve and FIG. 13 is apartial view of the outer face of the same.

FIGS. 14 to 18a inclusive show several forms of vanes which may be used.

FIG. 19 shows a portion of a reversible rotor and cam ring.

In the drawings, the pump is shown as comprising a housing consisting oftwo parts, a main portion A and a cap member B. The portion A isprovided with an axial opening in which is mounted a drive shaft C, asuitable anti-friction bearing D and oil seal H being mounted in anenlarged portion of the axial opening. The shaft C extends through thehousing portion A and into a recess 20 in the cap B, a suitable plainbearing 20A receiving the shaft end in the recess, the bearing 20A beingprovided with a shoulder 20B abutting a coacting shoulder in the recessto position the bearing and prevent free access of fluid to the recess.

The housing portion A is provided with a fluid inlet E and outlet F. Thehousing portion A is provided with a cylindrical bore, with which theshaft is coaxial, and has mounted within the bore the active workingparts of the pump comprising the cheek plates 21 and 22, the cam ring 23and the rotor 24. The cheek plates and cam ring are fixed together Withthe camring between the plates and the rotor is within the ring.

As shown, the cheek plate 21 is provided with a rather large hub portion21A having a sufiiciently large axial opening to receive the outer raceof a roller bearing 21B, the inner race of which is a sleeve 21C keyedto the shaft C and sleeve 21C is provided at the end adjacent the rotor24, with teeth 21D interfitting with similar teeth 24A carried by therotor 24. The outer end of hub 21A extends into an enlarged recess incap B but is spaced therefrom for a purpose to be described later.

The check plate 21 is also provided with a substantially radiallyarranged conduit 21E opening to the inner face of. the plate at 21F, theopening being arcuate and so located as to register with the bottomportions of the vane slots in the rotor 24. The plate 21 is alsoprovided with a small through passage 21G near its periphery.

The check plate 22, shown in elevation in FIG. 8, is provided in itsinner face with a recess 22A somewhat greater in diameter than the shaftC, and has a radially arranged conduit 22B leading from the recess tonear the periphery and opening through a lateral passage 22C to theoutlet F.

The plate 22 is also provided in its outer face with a channel 22Dextending inwardly from the periphery and with a plurality of smallthrough passages 22E spaced evenly about the central recess and solocated as to register with the bottom portions of the vane slots in therotor. These passages 22E have the same spacing as the vane slots butare less in number than the slots, the first one of the series,designated 122E, being so located as to be approximately opposite butout of registration with the opening 21F in the direction of rotation ofthe rotor by a distance somewhat less than the diameter of the enlargedbottom portion of the vane slot.

The inner face of plate 22 shows the inner ends of the passages 22E tobe enlarged in the direction of rotation of the rotor as at 22F and alsoshows a larger opening 22G of the same size and at a location oppositethe opening 21F in plate 21. This opening 22G communicates with thepassage 22H leading to the periphery of the plate 22. The plate is alsoprovided with a small through passage 22M.

The cam ring 23 consists of a hardened steel ring of suitable widthaxially and of varying thickness radially so that the inner peripheryforms a spiral from about the point N clockwise to about the point P.The surface from about the point P to the point 0 is on a fixed radiusabout the center and from the point 0 to the point N the surface is onan increasing radius so that this ramp portion merges smoothly into thearcuate and spiral por tions.

The ring 23 is also provided with more or less tangentially arrangedpassages 23A from the outer to the inner peripheries of the ring andthrough the ramp portion (from O to N). There is also a passage 2313 tothe outer periphery arranged tangentially at right angles to the axes ofpassages 23A just beyond the latter in the direction of rotation of therotor, and the ring is provided with a small passage 23C extendingaxially.

The rotor 24 is shown in FIGS. 1, 5 and 9. This consists of a discmounted on shaft C and driven thereby as mentioned above. The outerperiphery of the disc is provided with equidistant radial slots 24B inwhich are slidably carried vanes 25, the slots being enlarged at theirbottoms as shown. Radially inward of the slots 24B and opposite thespaces between the slots, the disc is provided with a plurality ofpassages 24C opening to that,

face adjacent cheek plate 22 and connected to radial passages 24Dopening to the periphery of the disc between vane slots 24B andpreferably widened as shown.

For a purpose to be described later, each of the vane slots, as shown inFIG. 9, may be connected through a small passage 24E to the periphery ofthe disc ahead of and behind its vane, the passage leading laheadof thevane being smaller in capacity than the other.

In the rotor of FIG. 5, the passages 24E have been omitted and in therotor of FIG. 19 the passages 124E are of the same size.

The just mentioned differences in the rotor require 3 different forms ofvanes and several vanes are shown in FIGS. 10, 11 and 14 to :18.

In FIGS. 14 and 14A is shown the form of vane indicated at 25 in FIG. 9.This consists of a rectangular metal plate having one edge bevelled asat 25A, this being the edge contacting the cam ring 23. FIG. 14 is aside view and FIG. 14A is a bottom end view of such a vane.

The vanes for use with rotors not provided with passages 24E are shownin FIGS. l0, 11, 16, 17 and 18.

In FIGS. and =11, showing respectively a side and end view of a vane,the plate 125 constituting the vane has one edge 125A bevelled at alarge angle. This is the outer edge of the vane contacting the ring 23with the face of the bevel trailing. (See FIG.5.) The vane 125 also hasthe lateral edges of the front end rear faces also bevelled, the bevels125B at the shorter or trailing face being somewhat larger than those125C at the longer or forward face. This form of vane is shown in FIG.5.

As indicated in FIG. 19, in those pumps in which the rotor isreversible, the passages 124E corresponding to passages 24E arepreferably of the same size both forward and behind the vanes and a vanesuch as is shown in FIGS. 15 and 15A is used. These show respectively aside and bottom end view of the vane which consists of a rectangularplate 150 having one edge double bevelled as at 150A, the two bevelfaces being substantially equal.

In FIGS. 16 and 16A, the vane '160 is double bevelled at 160A as is thatin FIG. 15 but are shown as having the four later-a1 corners chamferedas at 160B, the chamfers being equal.

In FIGS. 17 and 17A, the vane 170 is also double beveled as at 170A,but, instead of chamfering the corners, a small passage 170B extendsfrom each of the bevel faces to the lower end of the vane. Thesepassages are shown as of equal size.

In FIGS. 18 and 18A the vane 180 is double bevelled at one end as at180A and provided with a groove 180B in each side face extendinglengthwise from a bevel face to the rear end. The grooves are shown asequal in size.

Fixed to the rotor disc and rotating therewith is a valve edge carryinga plurality of spring pressed iball valves 30A adapted to close the endsof passages 24C. The cage and valves are located in the recess 22A inplate 22 which, as stated above, communicates with the outlet F throughpassages 22B and 22C.

The housing member A is provided with an axial recess which is open tothe inletE through the channel 22D and in this recess is mounted forrotation a ring 36 which is spaced from the peripheral wall of therecess and carried upon a sleeve 37 in turn carried upon a bushing 38,the latter extending into the axial opening in plate 22.

The ring 36, as shown more in detail in FIGS. 12 and 13, is rectangularin cross section and provided on its outer periphery with a short gearsegment 36A. It is also provided with a plurality of axially extendingthrough passages 363 into which lead radial passages 36C and upon theface adjacent plate 22 the passages 36B are slotted as shown at 36D inFIG. 12, the slots being graduated in length, each slot being somewhatshorter than the preceding slot (moving clockwise of FIG. 12). Theseslotted passages are equal in number and spacing to the spaced passages22E in plate 22 and so located as to register therewith when the ring 36is in one extreme position of partial rotation.

However, the slots 36D are so proportioned that, when the ring is in itsother extreme position, all of the passages 22E are closed, andprogressive rotation of the ring opens the passages progressively. Forexample the first slot 36D upon moving the ring 36, opens the firstpassage 22E and is long enough to maintain it open as the ring is movedaround. Further, when the second passage is opened, it also remains openwith further movement of the ring and so on until all of the passages22E are open.

Rotation of ring 36 may be accomplished by means of a rack 40 coactingwith the gear segment 36A and ex- 4 4 tending to the outside of thehousing through a suitable packing 41 and operable by a lever 42.

In the operation of the pump, with suitable motive power applied toshaft C rotating the shaft and the rotor 24, fluid will enter the inletE and its lateral extension EE and pass into the rotor chamber throughthe passages 23A which lead to the intravane spaces. At the same time,-

the fluid will flow through the passages 21E (plate 21) and 22H (plate22) to the bottoms of the vane slots 24B,

causing the vanes 25 to move outwardly.

With the ring 36 in the position indicated in FIGS. 2 and 12, that is,in the position in which all of the passages 22B are closed, the vaneswill be held out against the cam ring 23 from about the point N and thepump will operate at full capacity.

When the ring 36 is rotated by the rack 40 to open one or more of thepassages 22E, the vanes will not begin actively moving fluid untillater, depending upon the number of passages 22E that have been keptclosed. The output of the pump may therefore be adjusted from fullcapacity to substantially zero capacity. With the adjustment for full orpartial output, pressure in the outlet passage 2213 will producepressure in the small conduit 22M23C-21G leading to the chamber 45outside of check plate 21 and force the cheek plate and cam ringassembly toward the left (FIG. 1) and any leakage from this chamber pastthe bushing 20A into the recess 20 in housing member B, will be returnedto the inlet E through passage 46. Leakage at the other end of theshaft, past the bushing 38, will also be returned to the inlet B throughpassage 47.

Provision is also made to eliminate solid particles entering the pump byarranging the tangential passage 23B just beyond the fluid inlets 23A inthe ring 23. As the fluid flows in through the inlets 23A and is movedrapidly clockwise (FIG. 5), the solid particles will be thrown into thepassage 23B and be collected in a small chamber 49 provided in housing Aand normally closed by a plug 48.

It will be noted that three forms of rotor are shown. The one in FIG. 5is indicated as without the passages 24E or 124E while the rotor of FIG.9 is provided with the passages of different size and that of FIG. 19shows similarly located passages 124E but of the same size. It will alsobe noted that the vanes of FIGS. 5, 10 and 11 with the chamfered cornersprovide fluid conduit means leading from the periphery of the rotor tothe bottoms of the vane slots ahead of and behind the vanes with respectto rotor rotation. Like the vanes of FIGS. 16 to 18 they are providedwith chamfers or passages located so as to provide conduit means leadingfrom the bottoms of the vane slots to the periphery of the rotor aheadof and behind the vane.

The purpose and function of the passages 24E, 124E and the chamfering isto control the force between the outer edge of a vane and the cam ring23.

If, as is commonly done in pumps of the vane type, the back pressurefrom the delivery is utilized to hold the vanes out against the ring,the pressure between vane and ring is so high that excessive wear ofthese parts reduces the life of the pump, and delivery pressures must,therefore be lowered.

I claim:

1. Vanes for use in a fluid pump of the vane type wherein a rotorcarrying radially slidable vanes in slots in its periphery is surroundedby a cam ring contacting the outer edges of said vanes and determiningthe radial position thereof, said vanes comprising rectangular plateshaving their ring contacting outer edges bevelled and having the lateraledges of their faces bevelled to thereby form continuously openpassageways leading from the pumping chamber to the inner end of thevane slots both ahead of and behind the vanes to control the pressureacting on the inner end of said vanes.

2. Vanes for use in a fluid pump of the vane type wherein a rotorcarrying radially slidable vanes in slots in its periphery is surroundedby a cam ring contacting the outer edges of said vanes and determiningthe radial position thereof, said vanes comprising rectangular plateshaving their ring contacting outer edges bevelled and having the lateraledges of their forward faces bevelled, and also having the lateral edgesof their rearward faces bevelled but to a greater degree to thereby formcontinuously open passageways leading from the pumping chamber to theinner end of the vane slots both ahead of and behind the vanes tocontrol the pressure acting on the inner end of said vanes.

References Cited in the file of this patent 6 Vickers Feb. 21 1933 WadeFeb. 26, 1935 Livermore Mar. 31, 1942 Rosen Jan. 15, 1946 Stephens June14, 1949 MacMillin et a1. Mar. 13, 1951 Senninger Nov. 13, 1951 ErnstSept. 30, 1952 Ernst Sept. 30, 1952 Vincent Dec. 23, 1952 Minshall Oct.6, 1953 Garner Oct. 27, 1953 Gassot Aug. 30, 1955 Kovach Oct. 4, 1955Lindberg Dec. 27, 1955 Prendergast Jan. 24, 1956 FOREIGN PATENTS GreatBritain of 1911 Great Britain Jan. 2, 1946 France Nov. 18, 1930 FranceFeb. 10, 1931

1. VANES FOR USE IN A FLUID PUMP OF THE VANE TYPE WHEREIN A ROTORCARRYING RADIALLY SLIDABLE VANES IN SLOTS IN ITS PERIPHERY IS SURROUNDEDBY A CAM RING CONTACTING THE OUTER EDGES OF SAID VANES AND DETERMININGTHE RADIAL POSITION THEREOF, SAID VANES COMPRISING RECTANGULAR PLATESHAVING THEIR RING CONTACTING OUTER EDGES BEVELLED AND HAVING THE LATERALEDGES OF THEIR FACES BEVELLED TO THEREBY FORM CONTINUOUSLY OPENPASSAGEWAYS LEADING FROM THE PUMPING CHAMBER TO THE INNER END OF THEVANE SLOTS BOTH AHEAD OF AND BEHIND THE VANES TO CONTROL THE PRESSUREACTING ON THE INNER END OF SAID VANES.